Use union instead of overload fo DOMMatrix/DOMMatrixReadOnly

third_party/WebKit/Source/core/geometry/DOMMatrixReadOnly.idl

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // https://dev.w3.org/fxtf/geometry/#DOMMatrix
 
 [
-    Constructor,
-    Constructor(DOMString transformList),
-    Constructor(sequence<unrestricted double> numberSequence),
+    Constructor(optional (DOMString or sequence<unrestricted double>) init),
     RaisesException=Constructor,
     Exposed=(Window,Worker),
     RuntimeEnabled=GeometryInterfaces,
 ] interface DOMMatrixReadOnly {
     [RaisesException, NewObject] static DOMMatrixReadOnly fromMatrix(optional DOMMatrixInit other);
     [RaisesException, NewObject] static DOMMatrixReadOnly fromFloat32Array(Float32Array array32);
     [RaisesException, NewObject] static DOMMatrixReadOnly fromFloat64Array(Float64Array array64);
 
     // These attributes are simple aliases for certain elements of the 4x4 matrix
     readonly attribute unrestricted double a;
@@ skipping 52 matching lines @@
     DOMMatrix flipX();
     DOMMatrix flipY();
     DOMMatrix inverse();
 
     DOMPoint transformPoint(optional DOMPointInit point);
     Float32Array toFloat32Array();
     Float64Array toFloat64Array();
     stringifier;
     serializer = { attribute };
 };